Alaska notoriously experiences a lot of seismic activity, and in the first nine days of 2019 has been shaken by 81 earthquakes of a magnitude 2.5 or higher according to the United States Geological Survey. Of these, five have been magnitude 4.5 or higher, with one reaching magnitude 6.1. This huge quake took place 54km south-southwest of Tanaga Volcano on January 5.